Active&passive rfid

Active&passive rfid - Part 1: Active and Passive...

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Page 1 of 12 Part 1: Active and Passive RFID: Two Distinct, But Complementary, Technologies for Real-Time Supply Chain Visibility Active RFID and Passive RFID technologies, while often considered and evaluated together, are fundamentally distinct technologies with substantially different capabilities. In most cases, neither technology provides a complete solution for supply chain asset management applications. rather, the most effective and complete supply chain solutions leverage the advantages of each technology and combine their use in complementary ways. This need for both technologies must be considered by RFID standards initiatives to effectively meet the requirements of the user community. I. Introduction This paper 1 presents the characteristics and relative merits of Active and Passive RFID technologies and their applicability for real-time supply chain asset management. This paper is organized as follows: Description and comparison of the technical characteristics of Active and Passive RFID Mapping of the technical characteristics of each technology into functional capabilities Discussion of the applicability of each technology to supply chain visibility, based on functional capabilities Overview of mixed-use applications and the complementary nature of Active and Passive RFID Considerations for RFID standards initiatives Conclusions and recommendations II. Technical Characteristics of Active and Passive RFID Although they both fall under the “RFID” moniker and are often discussed interchangeably, Active RFID and Passive RFID are fundamentally different technologies. While both use radio frequency energy to communicate between a tag and a reader, the method of powering the tags is different. Active RFID uses an internal power source (battery) within the tag to continuously power the tag and its RF communication circuitry, whereas Passive RFID relies on RF energy transferred from the reader to the tag to power the tag. While this distinction may seem minor on the surface, its impact on the functionality of the system is significant. Passive RFID either 1) reflects energy from the reader or 2) absorbs and temporarily stores a very small amount of energy from the reader’s signal to generate its own quick response. In either case, Passive RFID operation requires very strong signals from the reader, and the signal strength returned from the tag is constrained to very low levels by the limited energy. On the other hand, Active RFID allows very low-level signals to be received by the tag (because the reader does not need to power the tag), and the tag can generate high-level signals back to the reader, driven from its internal power source. Additionally, the Active RFID tag is continuously powered, whether in the reader field or not. As discussed in the next section, these differences impact communication range, multi-tag collection capability, ability to add sensors and data logging, and many other functional parameters. 1
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Active&passive rfid - Part 1: Active and Passive...

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